Improving radiation dose efficiency of X-ray differential phase contrast imaging using an energy-resolving grating interferometer and a novel rank constraint
Improving radiation dose efficiency of X-ray differential phase contrast imaging using an energy-resolving grating interferometer and a novel rank constraint
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DOI：
10.1364/oe.24.012955
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发表时间：
2016-06-13
期刊：
影响因子：
3.8
通讯作者：
Chen, Guang-Hong
中科院分区：
文献类型：
--
作者：
Ge, Yongshuai;Zhang, Ran;Chen, Guang-Hong
本文提出了一种提高辐射剂量效率的新方法，基于光栅的X射线微分相衬（DPC）成像系统的剂量归一化对比噪声比（CNRD），该成像系统与能量分辨光子计数探测器集成。该方法利用了从不同能量窗口获取的空间-光谱DPC图像矩阵的低维性。开发了空间光谱图像矩阵的低秩近似，以减少图像噪声，同时保留每个能量窗口的DPC信号准确度。数值模拟和实验体模研究已被执行，以验证所提出的方法，通过显示每个能量窗口的噪声降低和CNRD改善。(C)2016美国光学学会
In this paper, a novel method was developed to improve the radiation dose efficiency, viz., contrast to noise ratio normalized by dose (CNRD), of the grating-based X-ray differential phase contrast (DPC) imaging system that is integrated with an energy-resolving photon counting detector. The method exploits the low-dimensionality of the spatial-spectral DPC image matrix acquired from different energy windows. A low rank approximation of the spatial-spectral image matrix was developed to reduce image noise while retaining the DPC signal accuracy for every energy window. Numerical simulations and experimental phantom studies have been performed to validate the proposed method by showing noise reduction and CNRD improvement for each energy window. (C) 2016 Optical Society of America